Blade Clearance Sensor Rotor Imbalance Detection
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Solution Overview
Problem
Current methods for detecting rotor imbalance in gas turbine engines require special test instrumentation and ground support equipment, leading to time-consuming and inconvenient processes that necessitate the engine being out of service.
Innovation Solution
Utilizing blade clearance sensors to determine the magnitude and location of rotor imbalance by analyzing the offset in blade clearance information, which can be processed using techniques like fast Fourier transforms to identify the apparent center and calculate the magnitude and location of the imbalance, allowing for real-time monitoring without additional instrumentation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If special test instrumentation and ground support equipment are used to detect rotor imbalance, then measurement precision is improved, but device complexity and loss of time increase
Solution Approach 1:
The blade clearance sensor, originally designed for monitoring blade tip clearance, is repurposed to also detect rotor imbalance by analyzing clearance variations during rotation. This multi-functional use eliminates the need for separate imbalance detection instrumentation, reducing device complexity while maintaining measurement capability
Solution Approach 2:
The existing blade clearance monitoring system serves dual purposes by simultaneously providing clearance information and imbalance detection. The system uses its own sensor data to identify rotor imbalance conditions without requiring external specialized equipment, enabling self-service functionality
2Measurement precision
If special test instrumentation is installed to detect rotor imbalance, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The blade clearance sensor performs both its original clearance monitoring function and new imbalance detection function simultaneously, eliminating the need for separate instrumentation installation and the associated engine downtime
Solution Approach 2:
The imbalance detection capability is already embedded in the blade clearance monitoring system before engine operation begins. The system continuously collects clearance data that can be analyzed for imbalance conditions, eliminating the need for preliminary instrumentation installation
3Measurement precision
If ground support equipment is used for rotor imbalance detection, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The blade clearance monitoring system automatically detects rotor imbalance conditions using its existing sensor data, eliminating the need for external ground support equipment and simplifying the detection process to a fully automated operation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables real-time detection and correction of rotor imbalance without taking the engine out of service, providing immediate warnings and maintenance information to pilots and allowing for routine maintenance without downtime.
Implementation Method 1
analyzing the offset in blade clearance information, which can be processed using techniques like fast Fourier transforms to identify the apparent center and calculate the magnitude and location of the imbalance
Data Source
AI summary
A system and method can be utilized to determine an out of balance condition of a rotor having a plurality of blades. The system monitors a clearance between the blades and an associated housing. By looking at a center of that clearance information, a determination can be made of the magnitude of imbalance of the rotor.